Reactions between alkylaminobis(trifluoromethyl)phosphines and boron trihalides
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 226-229
- https://doi.org/10.1039/j19680000226
Abstract
The reaction between alkylaminobis(trifluoromethyl)phosphines, RNH·P(CF3)2, and boron trihalides is complex and the products depend on the reaction conditions and on the nature of both the alkyl group and the boron trihalide. At low temperatures 1:1 adducts are formed but at room temperature the predominant reaction is cleavage of the N–P bond to give halogenobis(trifluoromethyl)phosphines, (CF3)2PX, and alkylaminoboron–halogen compounds: At –78°: RNH·P(CF3)2+ BX3= RNH·P(CF3)2,BX3 At 25°: RNH·P(CF3)2+ BX3=(CF3)2PX + RNH·BX2 where R = But and X = F or Cl. When R = Me or Et the aminoboron product of the second reaction disproportionates into a boron trihalide adduct and the corresponding borazine: 2RNH·BX2= RNH2,BX3+⅓(RNBX)3 A second reaction sequence results in elimination of hydrogen chloride and the formation of the new alkylbis(trifluoromethyl)phosphinylaminoboron dichlorides (CF3)2PN(R)BCl2 where R = Me or But. These compounds are unstable liquids and have been characterised by analysis, molecular weight, and infrared spectra, and by proton, boron-11, and phosphorus-31 n.m.r. spectra. The methyl compound is dimeric and the t-butyl compound monomeric, and possible structures are discussed.Keywords
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